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  • 1980-1984  (5)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    High-temperature mechanical properties of Li2O-Al2O3-SiO2 (LAS) glass ceramics (1981)
    Springer
    Journal of materials science 16 (1981), S. 1881-1886 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Slow crack growth at elevated temperatures is studied in one experimental and two commercial LAS glass ceramics. All show intergranular crack growth with the crack also passing along the interfaces of precipitates even when these are needle-shaped. The commercial materials differ from the experimental in that the shape of the cracks in them indicates an environmental effect absent in the experimental material. In one of the commercial materials, lifetimes as a function of initial stress-intensity factors are determined. Lifetimes are found to increase as the testing temperature is reduced and as the material is heat treated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540636
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure and grain growth in Li2O-Al2O3-SiO2 glass ceramics (1982)
    Springer
    Journal of materials science 17 (1982), S. 2671-2676 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Microstructure and grain growth were studied in two glass ceramics of the Li2O-Al2O3-SiO2 system, one an experimental material of basic composition Li2O-Al2O3-4SiO2 and the second a commercial material of approximately 0.7Li2O-Al2O3-6SiO2 composition with small amounts of other oxides. There was evidence from transmission electron microscopy that the commercial material contained residual glass at grain-boundary triple points and glass layers at some but not all grain boundaries. No definite evidence was found for residual glass in the experimental material. The composition of secondphase regions in the commercial material was studied by STEM microanalysis. Al-rich regions of irregular morphology were found but there was no evidence that residual glass was SiO2-rich, as has been previously suggested for this type of glass-ceramic. Grain growth showed a fairly similar time dependence in the two materials with growth more rapid in the commercial material at a given temperature. It is suggested that grain growth is controlled by precipitate particles rather than by residual glass phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543903
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High-temperature mechanical properties of Li2O-Al2O3-SiO2 (LAS) glass ceramics (1981)
    Springer
    Journal of materials science 16 (1981), S. 1874-1880 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructures and creep properties of one experimental and two commercial LAS glass ceramics have been studied. The commercial materials creep at lower temperatures and exhibit more prominently non-linear creep (creep rate decreasing with time). Heat treatment causes grain growth and a redistribution of precipitate and leads to a reduction in creep rates in all materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540635
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Phase transformations in dicalcium silicate (1983)
    Springer
    Journal of materials science 18 (1983), S. 1615-1624 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The β → γ transformation in dicalcium silicate has been studied by a combination of optical microscopy and transmission electron microscopy (TEM). The γ-phase forms as long needles or laths whose long axis is parallel to [001] γ. These tend to occur in bundles. TEM shows that regions of γ in partially transformed specimens are not internally twinned but contain a high density of dislocations and of low angle grain boundaries running parallel to the long axis of the particles. γ particles can be induced to form by the stress near a microhardness indentation. The nature of the β → γ transformation and the effect of the very large dilatation (14%) which accompanies the transformation are discussed. The α′ ⇄ β transformation has been studied on a TEM hot stage. It is confirmed that (100) β twins are formed on cooling through the α′ → β transformation temperature. Local stresses set up at the intersection of twin lamellae with domain boundaries are relaxed by slip on (100).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542054
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Portland cement clinker viewed by transmission electron microscopy (1981)
    Springer
    Journal of materials science 16 (1981), S. 1063-1070 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thin sections of Portland cement clinker have been prepared by ion-beam thinning and examined in the electron microscope. The three most abundant phases, alite, belite and tricalcium aluminate have been identified. Features of interest include unexplained reflections in the diffraction patterns from alite and internally twinned or faulted martensite plates in belite. Hydrate gel coatings are obtained on the silicate phases but not on the aluminate phase, by immersing the thinned clinker in water. Dislocations in the aluminate phase do not appear to affect its reaction with water. On alite, easily observable hydrate coatings are obtained after immersion times as short as 5 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542753
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    Paper (German National Licenses)
    Fulltext
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